(call) - JavaScript

function calls

(call receiver? args?)

Where:

1. receiver: the function being called (the x in x()) *
2. args: arguments supplied to the call *

Matching:

1. regular calls, e.g. x()
2. dynamic imports, e.g. import()

Examples

Remove leftover debug logging before a release by finding calls to console.log.

(call (mem log console))

Selects in lines { 1 } but not in { 2, 3 }:

console.log("debug", payload)
console.info("debug", payload)
logger.log("debug", payload)

---

Find setTimeout calls that execute string code instead of a callback.

(call setTimeout (arg 1 (str)))

Selects in lines { 1 } but not in { 2, 3 }:

setTimeout("window.location.reload()", 1000)
setTimeout(() => window.location.reload(), 1000)
setTimeout(() => {}, 0)

---

Harden API requests by finding POST fetch calls that omit headers.

(call fetch
  (:and
    (arg 2 (obj (prop method (str "POST"))))
    (:not (arg 2 (obj (prop headers))))))

Selects in lines { 1 } but not in { 2, 3, 4 }:

fetch("/api/users", { method: "POST" })
fetch("/api/users", { method: "POST", headers: { "Content-Type": "application/json" } })
fetch("/api/users", { method: "GET" })
fetch("/api/users")

---

Arguments

receiver

1. Identifier: shorthand for (id)
   
2. Pattern: shorthand for (id)
   
3. (:into)
4. (:nearest)
5. (:and)
6. (:or)
7. (:not)
8. (:text)
9. (:kind)
10. (:replace)
11. (:replace-in)
12. (:capture)
13. (:ref)
14. (arr)
15. (attr)
16. (bool)
17. (call)
18. (child)
19. (comp)
20. (export)
21. (fun)
22. (id)
23. (id+)
24. (import)
25. (jsx)
26. (mem)
27. (null)
28. (num)
29. (obj)
30. (of)
31. (prop)
32. (regex)
33. (regex+)
34. (str)
35. (str*)
36. (str+)
37. (tpl)
38. (tpl*)
39. (var)

args

1. (arg)
   
2. (:into)
3. (:nearest)
4. (:and)
5. (:or)
6. (:not)
7. (:text)
8. (:kind)
9. (:replace)
10. (:replace-in)
11. (:capture)